Padlock

ABSTRACT

The padlock according to this invention comprises a hard metal barrel, a hard metal shackle of a U-form, a locking bar which is rotatively placed within said barrel and extends at right angles to the legs of the shackle so as to intersect partially and a cylinder head for bringing said locking bar to locking or unlocking position. At the intersections, said locking bar and the legs of shackle are provided with semicircular depressions. The characteristic of this invention resides in installing the cylinder head free of picking or tampering. For this purpose, the cylinder head is inserted in a hard metal cylindrical block from behind and the latter is placed in the corresponding frontal depression of the barrel and fixed thereto by means of screws inserted from behind. Long holes for admitting the entrance of a screw driver are drilled within the barrel so as to extend at right angles to the legs of the shackle.

IInited States Patent 1191 Hori 1451 Dec. 24, 1974 PADLOCK [75]Inventor: Hideo Hori, Tokyo, Japan [73] Assignee: Hori Lock KogyoKabushiki Kaisha,

Minatoku, Tokyo, Japan [22] Filed: May 2, 1973 [21] Appl. No.: 356,492

[52] US. Cl 70/38 A, 70/417, 70/DIG. 57 [51] Int. Cl E05b 67/22 [58]Field of Search 70/38 A, 41-7, DIG. 57, 70/38 R, 38 B, 38 C, 39

[56] I 7 References Cited UNITED STATES PATENTS 1,384,590 7 1921 Bottone70/39 x 3,473,356 10/1969 Niilola 70/417 X FOREIGN PATENTS ORAPPLICATIONS 152,787 3/1938 Austria 70/38 A 686,327 3/1965 Italy 70/39512,796 10/1920 France 70/38 B 530,944 7/1955 Italy 70/38 A PrimaryExaminer-Robert L. Wolfe Attorney, Agent, or Firm-Charles E. Temko [57]ABSTRACT The padlock according to this invention comprises a hard metalbarrel, a hard metal shackle of a U-form, a locking bar which isrotatively placed within said barrel and extends at right angles to thelegs of the shackle so as to intersect partially and a cylinder head forbringing said locking bar to locking or unlocking position. At theintersections,-said locking bar and the legs of shackle are providedwith semicircular depressions. The characteristic of this inventionresides in installing the cylinder head free of picking 0r tampering.For this purpose, the cylinder head is inserted in a hard metalcylindrical block from behind and the latter is placed in thecorresponding frontal depression of the barrel and fixed thereto bymeans of screws inserted from behind. Long holes for admitting theentrance of a screw driver are drilled within the barrel so as to extendat right angles to the legs of the shackle.

1 Claim, 6 Drawing Figures PATENTEU DEC 24 I974 SHEEI 2 UP 2 FIG. 3

PADLOCK This invention has for its object to construct a sturdy andindestructible padlock.

In general, the padlock according to this invention consists of a barrelof solid hard metal block, shackle of a U-form adapted to be inserteddiagonally to said barrel, locking bar which is rotatively placed withinsaid barrel and is perpendicular to and parially intersects the legs ofsaid shackle, and a cylinder head for turning said locking bar tolocking or unlocking position. At the intersections, the legs of saidshackle and locking bar are provided with semi-circular depressions. Atthe locking position of said locking bar, uncut portions of said lockingbar enter into the corresponding semi-circular depressions of the legsof the shackle so as to hinder the latter from moving while at theunlocking position of said locking bar, the semi-circular depressionsprovided in said locking bar face opposite to the semi-circulardepressions provided in the legs of the shackle so as to release theshackle.

The, inventor takes greatest care to install the cylinder head withinthe barrel in order to prevent picking or tampering. According to thisinvention, the cylinder head is inserted to a metal block from behindand after said block is placed into the depression provided at the frontof the barrel, said block is fixed therein by means of screws insertedfrom behind. In order to turn the screws from behind, long holes aredrilled longitudinally in the barrel for admitting the entrance of along screw driver. Further, as said holes extend perpendicularly to thelegs of the shackle, and are blocked by the presence of the shackle, thetip of screw driver can not reachthe screws as long as the shackleremains in the barrel whereby it is impossible to pick or tamper thecylinder head.

i This invention will be better understood by the following descriptionwith reference to the accompanying drawings wherein:

FIG. 1 is a sectional view of the padlock according to this invention,

FIG. 2 is a side view of the same,

FIG. 3 is a front view of the barrel,

FIG. 4 is a rear view of the barrel showing a part of the shackle,

FIG. 5 shows cylindrical block in which the cylinder head is inserted,keyhole cover and cylinder head in perspective, and

FIG. 6 is a side view of the shackle.

l is a barrel of solid metal block. 8 is a shackle comprising long leg8A and short leg 88 adapted to be inserted diagonally to the barrel. Asshown in the drawings, while the long leg 8A passes through the barrel,the lower portion of the short leg 88 remains within the barrel. 6 is alocking bar rotatively placed within the barrel. Said locking barextends perpendicularly to the legs of the shackle and partiallyintersect said legs. At the intersections, the locking bar is providedwith semicircular depressions 7 7 and the legs 8A and 8B are providedwith corresponding semi-circular depressions 10 and 10 respectively. Inorder to turn said locking bar 6 to locking or unlocking position, acylinder head 4 is provided. Said cylinder head as well as keyhole cover3 are inserted to a flanged cylindrical block 2 from behind. Then thecylindrical block 2 is placed in a frontal depression provided in thebarrel and fixed thereto by means of screws l3 13 inserted from behind.Long holes 9 9 are drilled longitudinally through the barrel 1 so as toadmit the entrance of a long screw driver for turning said screws. Asshown, as said holes extend at right angles to the legs of the shackle,the tip of long screw driver can not reach the screw 13 13 as long asthe leg 8A remains in the barrel. 5 is the cam piece of the cylinderhead 4 engaging with the locking bar 6.

At the locking position of the locking bar 6 [FIG. I l], the uncutportions of the locking bar which are opposite to the semi-circulardepressions 7 7 are placed in the corresponding semi-circulardepressions l0 10 provided in the legs 8A and 8B whereby said legs arehindered from moving.

To unlock, a key 12 is inserted in the cylinder head 4 and turned itwhereby the locking bar 6 rotates and bring its semi-circulardepressions 7 7 quite opposite to the corresponding semi-circulardepressions 10 10. At this position, the shackle 8 is released and canmove freely until the ring 11 attached to one end of the long leg 8A isbrought into contact with the barrel 1.

According to this invention, as cylindrical block 2, barrel 1 andshackle 8 are made of tempered metal such as quenched steel, it isvirtually indestructible. Further, as the cylinder head 4 is completelyprotected by tempered metal cylindrical block, it is impossible to pickor tamper it.

Further, as the tip of a screw driver can not reach the screws 13 13 aslong as the long leg 8A remains in the barrel 1, it is impossible todismantle the cylinder head 4 from without.

In case of repairing or replacing the cylinder head, it is necessary toremove the ring 11 and withdrawing the shackle 8 completely from thebarrel at the unlocking position.

What I claim:

1. A padlock construction comprising a cylindrical barrel having aprincipal axis, a longitudinally extending bore commencing at one end ofsaid barrel, and a counter bore communicating with said bore at an innerend thereof; said barrel having a pair of transverse bores communicatingwith said counter bore; a shackle movable within said transverse boresbetween opened and closed positions, and selectively completelyremovable from said transverse bores, a locking bar rotably positionedwithin said counter bore and cooperating with said shackle toselectively immobilize the same, a lock body positioned within saidfirst mentioned bore and cooperating with said locking bar, said lockbody being accessible for the engagement of a key at one end of saidbarrel, said barrel having at least one elongated longitudinallyextending bore therein communicating atap an sitssnd said. kartsamtsrmiaat a ates inner counter bore of smaller diameter communic atingwith said first mentioned bore, said lock body hav ng at least onethreaded bore therein aligned with said inner counter bore, saidelongated bore intersecting at least one of said transverse bores insaid barrels; said lock body being maintained within said barrel bythreaded engagement with a screw inserted into said elongated bore,whereby subsequent insertion of said shackle into said barrel preventsaccess to said screw and unauthorized removal of said lock body fromsaid barrel.

1. A padlock construction comprising a cylindrical barrel having aprincipal axis, a longitudinally extending bore commencing at one end ofsaid barrel, and a counter bore communicating with said bore at an innerend thereof; said barrel having a pair of transverse bores communicatingwith said counter bore; a shackle movable within said transverse boresbetween opened and closed positions, and selectively completelyremovable from said transverse bores, a locking bar rotably positionedwithin said counter bore and cooperating with said shackle toselectively immobilize the same, a lock body positioned within saidfirst mentioned bore and cooperating with said locking bar, said lockbody being accessible for the engagement of a key at one end of saidbarrel, said barrel having at least one elongated longitudinallyextending bore therin communicating at an opposite end of said barreland terminating at an inner counter bore of smaller diametercommunicating with said first mentioned bore, said lock body having atleast one threaded bore therein aligned with said inner counter bore,said elongated bore intersecting at least one of said transverse boresin said barrels; said lock body being maintained within said barrel bythreaded engagement with a screw inserted into said elongated bore,whereby subsequent insertion of said shackle into said barrel preventsaccess to said screw and unauthorized removal of said lock body fromsaid barrel.